#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>

int main()
{
   pid_t id =  fork();
   if (id == 0)
   {
       //child
       while (1)
       {
           printf("I am child, pid:%d ppid:%d\n", getpid(),getppid());
           sleep(1);
       }
   }
   else
   {
       //parent
        while (1)
        {
            printf("I am child, pid:%d ppid:%d\n", getpid(),getppid());
            sleep(1);
        }
   }
    return 0;
}
